Its designed to work with the Dynaflex Pro Plus and Powerball. It easily adapts to each unit by simply removing the cap of the gyro and snapping the meter into place. The speed meter will upgrade either unit to the ultimate performance machine. This speed meter has 3 important functions:
1. Measures the users current speed.
2. Remembers the users highest rpm.
3. Calculates the maximum revolutions of the gyro.
This is excellent for competition play-offs, measuring your own strength or just for fun.